If you really want to add real member you can try telegram bounty with one time minimal payment in BTC which may help you to get real members.
Also, even if he adds those telegram accounts they will just easily left the group especially if they're not interested in the topic or telegram group.
You are right but spending some money to add the real people is better than buying botted telegram members.SInce lot of people were just adding the numbers only which is pretty useless for anything.